Intelligent led

Abstract

The invention relates to a light for illuminating a useable area, in particular a merchandise display area, comprising an adaptive illumination unit which has a number of coloured light-emitting diodes which emit light in the basic colours of a colour system, a sensor system directed towards the useable area which detects a light spectrum reflected by the useable area and/or objects lying on the useable area, and a control unit which is coupled to the sensor system and is designed to determine at least one dominant colour from the reflected light spectrum detected by the sensor system, and to actuate the light-emitting diodes to emphasise the at least one dominant colour such that they emit a light spectrum of a pre-specified colour temperature and/or intensity, in which the portion of the at least one dominant colour is increased.

1 . A light for illuminating a useable area, in particular a merchandise display area (W), comprising an adaptive illumination unit ( 1 ) which has a number of coloured light-emitting diodes which emit light in the basic colours of a colour system, a sensor system ( 2 ) directed towards the useable area (W) which detects a light spectrum reflected by the useable area (W) and/or objects lying on the useable area, and a control unit ( 3 ) which is coupled to the sensor system ( 2 ) and is designed to determine at least one dominant colour from the reflected light spectrum detected by the sensor system ( 2 ), and to actuate the light-emitting diodes to emphasise the at least one dominant colour such that they emit a light spectrum of a pre-specified colour temperature and/or intensity, in which the portion of the at least one dominant colour is increased, characterised in that at least a white light spectrum is stored or can be stored in the control unit ( 3 ) as a standard light spectrum with pre-specified colour temperature and/or intensity, the illumination unit ( 1 ) has at least one white light light-emitting diode in order to emit light in the white spectral range, and the control unit ( 3 ) actuates the white light light-emitting diode to emit the white light spectrum as the standard light spectrum, and additionally actuates the coloured light-emitting diodes to increase the portion of the at least one dominant colour, wherein the light-emitting diodes are actuated such that the modified light spectrum has a maximum intensity peak in the red spectral range at approximately 635 to 650 nm and a further minimum intensity peak in the green/yellow wavelength range at 490 to 560 nm, and finally an average intensity peak in the blue wavelength range at approximately 440 to 450 nm when red is the dominant colour and accordingly a white light spectrum with an increased red light portion is to be emitted, and/or wherein the light-emitting diodes are actuated such that the modified light spectrum has a maximum intensity peak in the red spectral range at approximately 635 to 650 nm, a further, average intensity peak in the green/yellow wavelength range at 495 to 566 nm, and finally a minimum intensity peak in the blue wavelength range at approximately 440 to 450 nm, when yellow is the dominant colour and accordingly a white light spectrum with an increased green/yellow light portion is to be emitted. 
     
     
         2 . The light according to  claim 1 , characterised in that the light-emitting diodes are actuated such that, assuming that the maximum standardised intensity in the red spectral range is 100%, the intensity peak in the green/yellow wavelength range is at 15 to 20% and in particular 17%, and the intensity peak in the blue wavelength range is at approximately 20 to 25%, in particular at approximately 22%, when a white light spectrum with an increased red light portion is to be emitted, and/or wherein the light-emitting diodes are actuated such that, assuming that the maximum standardised intensity in the red spectral range is 100%, the intensity peak in the green/yellow wavelength range is at 35 to 45% and in particular 40%, and the intensity peak in the blue wavelength range is at approximately 20 to 25%, in particular at approximately 22%, when a white light spectrum with an increased green/yellow light portion is to be emitted. 
     
     
         3 . The light according to  claim 1 , characterised in that the control unit ( 3 ) actuates the white light light-emitting diode to emit the white light spectrum as the standard light spectrum, and additionally actuates red, green and blue LEDs such that the modified light spectrum, which is produced by overlapping the light spectra emitted by the coloured light-emitting diodes and the white light light-emitting diode, is a white light spectrum with the increased red or green/yellow light portion. 
     
     
         4 . The light according to  claim 2 , characterised in that the control unit ( 3 ) actuates the white light light-emitting diode to emit the white light spectrum as the standard light spectrum, and additionally actuates red, green and blue LEDs such that the modified light spectrum, which is produced by overlapping the light spectra emitted by the coloured light-emitting diodes and the white light light-emitting diode, is a white light spectrum with the increased red or green/yellow light portion. 
     
     
         5 . The light according to  claim 1 , characterised in that a white light spectrum with an increased red light portion is stored or can be stored in the control unit ( 3 ) as a modified standard light spectrum, and the control unit ( 3 ) actuates the illumination unit ( 1 ) to emit this light spectrum if red is the dominant colour in the reflected light spectrum detected by the sensor system ( 2 ) and/or that a white light spectrum is stored or can be stored with an increased green/yellow light portion in the control unit ( 3 ) as a modified standard light spectrum, and the control unit ( 3 ) actuates the illumination unit ( 1 ) to emit this light spectrum if yellow is the dominant colour in the reflected light spectrum detected by the sensor system ( 2 ). 
     
     
         6 . The light according to  claim 2 , characterised in that a white light spectrum with an increased red light portion is stored or can be stored in the control unit ( 3 ) as a modified standard light spectrum, and the control unit ( 3 ) actuates the illumination unit ( 1 ) to emit this light spectrum if red is the dominant colour in the reflected light spectrum detected by the sensor system ( 2 ) and/or that a white light spectrum is stored or can be stored with an increased green/yellow light portion in the control unit ( 3 ) as a modified standard light spectrum, and the control unit ( 3 ) actuates the illumination unit ( 1 ) to emit this light spectrum if yellow is the dominant colour in the reflected light spectrum detected by the sensor system ( 2 ). 
     
     
         7 . The light according to  claim 1 , characterised in that the control unit ( 3 ) has a detection mode in which the illumination unit ( 1 ) and the sensor system ( 2 ) are controlled such that the illumination unit ( 1 ) emits a detection light spectrum and the sensor system ( 2 ) detects the light spectrum reflected by the useable area (W) and/or objects lying on the useable area (W) in order to determine the dominant colour in the reflected light spectrum, wherein preferably the control unit ( 3 ) is designed to select the detection mode automatically, at pre-specified times, in particular after switching on the light and/or during operation at pre-specified intervals of time and/or manually. 
     
     
         8 . The light according to  claim 2 , characterised in that the control unit ( 3 ) has a detection mode in which the illumination unit ( 1 ) and the sensor system ( 2 ) are controlled such that the illumination unit ( 1 ) emits a detection light spectrum and the sensor system ( 2 ) detects the light spectrum reflected by the useable area (W) and/or objects lying on the useable area (W) in order to determine the dominant colour in the reflected light spectrum, wherein preferably the control unit ( 3 ) is designed to select the detection mode automatically, at pre-specified times, in particular after switching on the light and/or during operation at pre-specified intervals of time and/or manually. 
     
     
         9 . The light according to  claim 1 , characterised in that the illumination unit ( 1 ) has a light mixing chamber ( 4 ) with a light outlet opening ( 6 ) in which the light-emitting diodes are arranged, and that the light mixing chamber ( 4 ) is designed to mix the light emitted by the light-emitting diodes before it passes out of the light mixing chamber ( 4 ), wherein preferably the internal surfaces of the light mixing chamber ( 4 ) are designed to be dispersively reflective and/or internal surfaces of the light mixing chamber ( 4 ) are provided with a reflection-enhancing coating, in particular a thin silver layer with a reflection-enhancing interference layer. 
     
     
         10 . The light according to  claim 9 , characterised in that a diffusion disc ( 7 ) is provided on the light outlet opening ( 6 ) of the light mixing chamber ( 4 ). 
     
     
         11 . The light according to  claim 9 , characterised in that there is provided in the light mixing chamber ( 4 ) a further sensor system ( 2 ) connected to the control unit ( 3 ) which detects the light spectrum of the light emitted by the light-emitting diodes and mixed in the light mixing chamber ( 4 ), the control unit ( 3 ) carrying out a permanent or recurring target/actual comparison of the light spectrum detected in the light mixing chamber ( 4 ) with the modified standard light spectrum to be emitted, and controlling the light-emitting diodes such that the light spectrum of the light mixed in the light mixing chamber corresponds to the pre-specified modified standard light spectrum. 
     
     
         12 . The light according to  claim 2 , characterised in that the illumination unit ( 1 ) has a light mixing chamber ( 4 ) with a light outlet opening ( 6 ) in which the light-emitting diodes are arranged, and that the light mixing chamber ( 4 ) is designed to mix the light emitted by the light-emitting diodes before it passes out of the light mixing chamber ( 4 ), wherein preferably the internal surfaces of the light mixing chamber ( 4 ) are designed to be dispersively reflective and/or internal surfaces of the light mixing chamber ( 4 ) are provided with a reflection-enhancing coating, in particular a thin silver layer with a reflection-enhancing interference layer. 
     
     
         13 . The light according to  claim 12 , characterised in that a diffusion disc ( 7 ) is provided on the light outlet opening ( 6 ) of the light mixing chamber ( 4 ). 
     
     
         14 . The light according to  claim 12 , characterised in that there is provided in the light mixing chamber ( 4 ) a further sensor system ( 2 ) connected to the control unit ( 3 ) which detects the light spectrum of the light emitted by the light-emitting diodes and mixed in the light mixing chamber ( 4 ), the control unit ( 3 ) carrying out a permanent or recurring target/actual comparison of the light spectrum detected in the light mixing chamber ( 4 ) with the modified standard light spectrum to be emitted, and controlling the light-emitting diodes such that the light spectrum of the light mixed in the light mixing chamber corresponds to the pre-specified modified standard light spectrum.